About: http://webisa.webdatacommons.org/6572439

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	In total, 60 ???70% of the gas produced by a balanced and well-functioning system consists of methane, with the rest being mostly carbon dioxide and minor amounts of nitrogen and hydrogen.
http://www.w3.org/ns/prov#wasQuotedFrom	issuu.com